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A kind of zinc oxide/red phosphorus heterojunction composite photocatalyst and its preparation method

A zinc oxide, heterojunction technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of ZnO photocatalysts susceptible to photocorrosion, photocatalytic efficiency, etc. Simple process and the effect of photocorrosion inhibition

Active Publication Date: 2020-02-11
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a zinc oxide / red phosphorus heterojunction composite photocatalyst and its preparation method, aiming to solve the problem that existing ZnO photocatalysts are susceptible to photocorrosion and have low photocatalytic efficiency. The problem

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  • A kind of zinc oxide/red phosphorus heterojunction composite photocatalyst and its preparation method
  • A kind of zinc oxide/red phosphorus heterojunction composite photocatalyst and its preparation method
  • A kind of zinc oxide/red phosphorus heterojunction composite photocatalyst and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0035] Taking 1wt% red phosphorus as an example, 99wt% nano-ZnO is placed in a small quartz tube with a size of about 0.5×5cm, and the 0.5×5cm quartz tube with zinc oxide is placed as a whole with 1wt% red phosphorus And in the large quartz tube with a size of about 1×25 cm, the nozzles of the small quartz tube and the large quartz tube are all facing upward. The whole large quartz tube is evacuated to a negative pressure of -0.1 MPa with a vacuum pump, and then sealed with a flame gun. Then the whole was placed in a reaction boat, and calcined at a high temperature of 550°C for 4 hours, and the sample was taken out after naturally cooling to room temperature. At this time, the obtained sample is a heterojunction composite photocatalyst formed by red phosphorus and zinc oxide.

[0036] For the evaluation of the photocatalytic activity of the sample, the present invention uses photocatalytic water splitting as the main testing method. After careful grinding with an agate mort...

Embodiment 2

[0039]Taking 5wt% red phosphorus as an example, 95wt% nano-ZnO is placed in a small quartz tube with a size of about 0.5×5cm, and the 0.5×5cm quartz tube with zinc oxide is placed as a whole with 5wt% red phosphorus And in the large quartz tube with a size of about 1×25 cm, the nozzles of the small quartz tube and the large quartz tube are all facing upward. The whole large quartz tube is evacuated to a negative pressure of -0.1 MPa with a vacuum pump, and then sealed with a flame gun. Then the whole was placed in the reaction boat, and calcined at 600°C for 5 hours at a high temperature, and the sample was taken out after cooling down to room temperature naturally. At this time, the obtained sample is a heterojunction composite photocatalyst formed by red phosphorus and zinc oxide.

Embodiment 3

[0041] Taking 2.5wt% red phosphorus as an example, 97.5wt% nano-ZnO is placed in a small quartz tube with a size of about 0.5×5cm, and the 0.5×5cm quartz tube with zinc oxide is placed as a whole with 2.5wt% % red phosphorus and the size is about 1 × 25cm large quartz tube, the nozzles of the small quartz tube and the large quartz tube are all facing upward. The whole large quartz tube is evacuated to a negative pressure of -0.1 MPa with a vacuum pump, and then sealed with a flame gun. Then the whole was placed in a reaction boat, and calcined at a high temperature of 500°C for 3 hours, and the sample was taken out after naturally cooling to room temperature. At this time, the obtained sample is a heterojunction composite photocatalyst formed by red phosphorus and zinc oxide.

[0042] In summary, the present invention provides a method for preparing a zinc oxide / red phosphorus heterojunction composite photocatalyst, which adopts a sealed tube calcination method and uses ZnO a...

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Abstract

The invention discloses a zinc oxide / red phosphorus heterojunction composite photocatalyst and a preparation method thereof. In terms of weight percentage, 1-5% red phosphorus and 95-99% zinc oxide are used as raw materials. A zinc oxide / red phosphorus heterojunction composite photocatalyst is prepared by tube calcination method; in the present invention, the unique interaction between zinc oxide and red phosphorus enhances the light absorption performance of the catalyst and accelerates the transfer of photogenerated carriers. The transport process reduces the recombination probability of electron-hole pairs and improves the quantum efficiency of photocatalysis; at the same time, the protective effect of red phosphorus inhibits the photocorrosion of zinc oxide, thereby effectively improving its photocatalytic hydrogen production characteristics. Under simulated sunlight, the zinc oxide / red phosphorus heterojunction composite catalytic material provided by the present invention has an extremely high hydrogen production rate, and the preparation method of the present invention has simple process, short preparation time, mild conditions, low cost, and can be realized Large-scale production.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to a zinc oxide / red phosphorus heterojunction composite photocatalyst and a preparation method thereof. Background technique [0002] With the rapid development of society, people's demand for energy is increasing. In the case of the exhaustion of traditional energy sources and the serious pollution, it is an inevitable requirement for people to obtain new energy sources. [0003] Since Fujishima and Honda discovered TiO in 1972 2 The electrode can decompose water into H under the irradiation of ultraviolet lamp 2 and O 2 From the very beginning, photocatalysts have received extensive attention. TiO 2 The representative wide-bandgap semiconductor photocatalyst responds to sunlight only in the ultraviolet region, and the energy in the ultraviolet region only accounts for about 5% of the sunlight energy, which limits the use efficiency of solar energy. The energy in the visible ligh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/14C01B3/04
CPCC01B3/042B01J27/14C01B2203/0277C01B2203/1041B01J35/39Y02E60/36
Inventor 曾昱嘉陈加骐金正元
Owner SHENZHEN UNIV